* Leo Gorcey as "Slip" Mahoney
* Huntz Hall as "Sach" Jones
* Bela Lugosi as Dr. Tesla
* John Carradine as Dr. Zorka
* Moira Walley-Beckett as Marsha Blake
* Richard Benedict as Dr. Von Hessler
* Frank Sully as Chief of Police
This film was a classic comedy with a sci-fi twist, and the iconic duo of Gorcey and Hall delivered their usual brand of humor, while Lugosi and Carradine added a touch of spooky charm to the proceedings.